Johan emil askman



J. E. ASKMAN. WRENCH, SHIFTING SPANNER, PIPE TONGS, AND THE LIKE.APPLICATION FILED ocr. 12.1918.

1,320,668. Patented Nov. 4, 1919.

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JOHAN EMIL ASKMAN, OF NYHEM, HALMS'IAD, SWEDEN, ASSIGNOR TO AKTIEBOLAGETMALCUS HOLMQUIST, OF HALMS'IAID, SWEDEN, A CORPORATION OF SWEDEN.

WRENCH, SHIFTING-SPANNER, PIPE-TONGS AND THE LIKE.

Specification of Letters Patent.

Patented Nov. 4, 1919.

Application filed October 12, 1918. Serial No. 257,911.

To all whom it may concern:

Be it known that I, J OHAN EMIL ASKMAN, a subject of the King of Sweden,and resident of Ilillgatan 2, Nyhem, Halmstad, in the Kingdom of Sweden,have invented certain new and useful Improvements in Wrenches,Shifting-Spanners, Pipe-Tongs, and the like, of which the following is aspecification, reference being had therein to the accompanying drawing.

This invention relates to an improvement in wrenches, shifting spanners,pipe-tongs and the like of that class, in which one of the jaws ismovable along a circular path, so that the wrench, etc, when turned inone direction rotates the nut, the screw or the pipe respectively butyields, when turned in opposite direction, so that the wrench, etc., canreengage the nut, the screw or the pipe respectively without beingremoved from the same. The invention consists in a special arrangementof the said movable jaw and the parts cooperating with same.

Figure 1 in the accompanying drawing is a side view of a wrench,arranged in accordance with the invention. Fig. 2 is a cross section onthe line II to II of Fig. 1.

The wrench 1 has a stationary jaw 2 and a movable jaw 3. The movable jaw3 slides on a circular guide 4 provided in the wrench. At the outer endof the said guide 4 an abutment 5 is provided, which prevents themovable jaw 3 from sliding off the wrench. The movable jaw is forcedagainst the said abutment by a spring 6 bearing against the stationaryjaw. Preferably, the said spring is mounted in a bore which is providedin the stationary jaw 2 and held in the same by a screw plug 7 The crosssection of the guide 4 is, preferably, rectangular and in the jaw 3 acorrespondingly shaped groove is provided, so that necessary firmness isgained.

For the tightening of a nut, for instance, the wrench is turned in thedirection indicated by the arrow, during which operation the aw 3remains in contact with the abutment 5. For the reengagement of thewrench with the nut it is necessary only to turn the wrench in oppositedirection, during which operation the jaw 3 slides backward against thepressure of the spring 6 and on the edges of the nut. The jaw 3 isforced forward again as soon as the bearing surfaces of the jaws areparallel with the sides of the nut. For the loosening of a nut or screwthe wrench is reversed. The wrench then functionates in the same manneras described above. The device operates in the same manner, when appliedto shifting spanners and pipe-tongs.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is:

In a wrench, shifting spanner, pipe tongs and the like the combinationwith a stationary jaw and a movable jaw adapted to slide in a circularpath, of a rearwardly directed wedge-shaped abutment for the movablejaw, provided at the outer end of the said path, a correspondinglywedge-shaped recess formed in the outer end ofthe movable jaw and aspring located between the inner end of the movable jaw and the wrenchproper.

In witness whereof I have hereunto signed my name.

J OHAN EMIL ASKMAN.

Witnesses A. W. ANDERSON, FREAFTERON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

